Enhanced strength-ductility synergy in an Al–Cu alloy via Cd-induced hybrid θ″+θ′ precipitation

In this work, trace Cd addition (∼0.2 wt%) was exploited in Al–Cu alloys to improve the mechanical properties by introducing the hybrid θ″+θ′ precipitates, as governed by the solid-solution temperature T. In detail, if the solid solution temperature is low (T = 500 °C), Cd microalloying merely initi...

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Bibliographic Details
Published in:	Journal of materials research and technology Vol. 30; pp. 1834 - 1842
Main Authors:	Bai, H.W., Wu, X., Zhao, W., Huangfu, B.H., Cheng, S.H., Wu, Z.Y., Liu, Y.J., Gao, Y.H., Liu, X.C.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-05-2024 Elsevier
Subjects:	Al–Cu alloy Cd microalloying Mechanical property Precipitation Solid-solution treatment Precipitation Al–Cu alloy Cd microalloying Solid-solution treatment Mechanical property
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Summary:	In this work, trace Cd addition (∼0.2 wt%) was exploited in Al–Cu alloys to improve the mechanical properties by introducing the hybrid θ″+θ′ precipitates, as governed by the solid-solution temperature T. In detail, if the solid solution temperature is low (T = 500 °C), Cd microalloying merely initiates undesirable dual precipitates of θ″ and θ′ with similar size and a homogenous distribution. In such case, the Cd-microalloyed Al–Cu alloy suffers from limited optimization on the strength-ductility synergy in comparison to the Cd-free Al–Cu alloy. However, elevating T to 530 °C results in the formation of dense Cd-rich nanoparticles, significantly promoting the hybrid θ″+θ′ precipitation with a bimodal distribution by offering numerous heterogeneous Cd-rich nucleation sites. Such hybrid θ″+θ′ precipitation imparts the architecture of microstructural heterogeneity, which was found to be responsible for the rapid age-hardening response and enhanced strength-ductility synergy in the Cd-microalloyed Al–Cu alloy.
ISSN:	2238-7854
DOI:	10.1016/j.jmrt.2024.03.209